I'm not a physisist so please take it easy on me. I've been watching the Sky At Night series on Youtube and they had a short discussion about string theory and gravity. It was the, "Our gravity might not be as strong as we think it should be because it is leaking into adjoining dimensions," argument. Assuming that this true for a moment and our gravity is leaking into other universes, what is leaking back our way? Or are we the "king of dimensions" and the sun rotates around the Earth, and we don't get anything from those other dimensions/universes?

There is a thought that dark matter may be gravity from other branes (a brane is kinda of a flat plane as opposed to a long string. ie: it is a string with length & width but no height whereas a string just has the length dimension).

This idea comes from M-theory and, may be, testable. If high energy particle collisions are found to yield less mass than the starting particles, it is theorized that this extra mass was knocked off 'our' brane into another dimension.

Pesse (In which case the Dimension of Cats would be very happy with all the extra string) Mist

I'm not a physisist so please take it easy on me. I've been watching the Sky At Night series on Youtube and they had a short discussion about string theory and gravity. It was the, "Our gravity might not be as strong as we think it should be because it is leaking into adjoining dimensions," argument. Assuming that this true for a moment and our gravity is leaking into other universes, what is leaking back our way? Or are we the "king of dimensions" and the sun rotates around the Earth, and we don't get anything from those other dimensions/universes?

And I thought it was just my new diet..

String theory is said to be a theory of gravity because it contains a spin-2 boson. Since the spin-2 boson is not really gravity (it's just the spin-2 boson), all such claims by string theorists are nonsense, and in fact you will never see them cook up a set of equations that reproduce even Newtonian gravity, much less GR.

That book was written in 2007'. Since then there have been suggestions that, at least, some small aspects of Superstring theory can be testable.

One problem is that we are talking at size levels for strings that makes measurements at distances less than what the Heisenberg uncertainty principle would allow.

According to Quantum theory we can't be precise enough to take a measurement of a single string...

However, in order for the general category of Superstring theories (and there are a lot!) something called Super-symmetry' must exist. Which, in very simple terms, means that every particle must have a matching particle with opposite spin.

So far, we know that this isn't the universe 'today'. Quarks have a preferential 'spin' and their counterpart is not found. However, these original supersymmetric quarks could have a preferential spin and selectively survived the original Universe after the big bang prior to which they were in equal numbers.

OK, that was a mouthful. But what does it have to do with String Theory? Well, the Higss Bosun was found at a weird (unnatural) energy level. If Supersymmetry was correct, then we should find a range of Higgs particles at different energy levels.

These Supersymmetric version of the Higgs would be evidence that, perhaps, there was something to Supersymmetry and, by extension, would be a supporting argument for String Theory.